/*
 * contrib/btree_gist/btree_bytea.c
 */
#include "postgres.h"
#include "knl/knl_variable.h"

#include "btree_gist.h"
#include "btree_utils_var.h"
#include "utils/bytea.h"

/*
** Bytea ops
*/
PG_FUNCTION_INFO_V1(gbt_bytea_compress);
PG_FUNCTION_INFO_V1(gbt_bytea_union);
PG_FUNCTION_INFO_V1(gbt_bytea_picksplit);
PG_FUNCTION_INFO_V1(gbt_bytea_consistent);
PG_FUNCTION_INFO_V1(gbt_bytea_penalty);
PG_FUNCTION_INFO_V1(gbt_bytea_same);

extern "C" Datum gbt_bytea_compress(PG_FUNCTION_ARGS);
extern "C" Datum gbt_bytea_union(PG_FUNCTION_ARGS);
extern "C" Datum gbt_bytea_picksplit(PG_FUNCTION_ARGS);
extern "C" Datum gbt_bytea_consistent(PG_FUNCTION_ARGS);
extern "C" Datum gbt_bytea_penalty(PG_FUNCTION_ARGS);
extern "C" Datum gbt_bytea_same(PG_FUNCTION_ARGS);

/* define for comparison */

static bool gbt_byteagt(const void* a, const void* b, Oid collation)
{
    return DatumGetBool(DirectFunctionCall2(byteagt, PointerGetDatum(a), PointerGetDatum(b)));
}

static bool gbt_byteage(const void* a, const void* b, Oid collation)
{
    return DatumGetBool(DirectFunctionCall2(byteage, PointerGetDatum(a), PointerGetDatum(b)));
}

static bool gbt_byteaeq(const void* a, const void* b, Oid collation)
{
    return DatumGetBool(DirectFunctionCall2(byteaeq, PointerGetDatum(a), PointerGetDatum(b)));
}

static bool gbt_byteale(const void* a, const void* b, Oid collation)
{
    return DatumGetBool(DirectFunctionCall2(byteale, PointerGetDatum(a), PointerGetDatum(b)));
}

static bool gbt_bytealt(const void* a, const void* b, Oid collation)
{
    return DatumGetBool(DirectFunctionCall2(bytealt, PointerGetDatum(a), PointerGetDatum(b)));
}

static int32 gbt_byteacmp(const void* a, const void* b, Oid collation)
{
    return DatumGetInt32(DirectFunctionCall2(byteacmp, PointerGetDatum(a), PointerGetDatum(b)));
}

static const gbtree_vinfo tinfo = {
    gbt_t_bytea, 0, TRUE, gbt_byteagt, gbt_byteage, gbt_byteaeq, gbt_byteale, gbt_bytealt, gbt_byteacmp, NULL};

/**************************************************
 * Text ops
 **************************************************/

Datum gbt_bytea_compress(PG_FUNCTION_ARGS)
{
    GISTENTRY* entry = (GISTENTRY*)PG_GETARG_POINTER(0);

    PG_RETURN_POINTER(gbt_var_compress(entry, &tinfo));
}

Datum gbt_bytea_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY* entry = (GISTENTRY*)PG_GETARG_POINTER(0);
    void* query = (void*)DatumGetByteaP(PG_GETARG_DATUM(1));
    StrategyNumber strategy = (StrategyNumber)PG_GETARG_UINT16(2);

    bool* recheck = (bool*)PG_GETARG_POINTER(4);
    bool retval = false;
    GBT_VARKEY* key = (GBT_VARKEY*)DatumGetPointer(entry->key);
    GBT_VARKEY_R r = gbt_var_key_readable(key);

    /* All cases served by this function are exact */
    *recheck = false;

    retval = gbt_var_consistent(&r, query, strategy, PG_GET_COLLATION(), GIST_LEAF(entry), &tinfo);
    PG_RETURN_BOOL(retval);
}

Datum gbt_bytea_union(PG_FUNCTION_ARGS)
{
    GistEntryVector* entryvec = (GistEntryVector*)PG_GETARG_POINTER(0);
    int32* size = (int*)PG_GETARG_POINTER(1);

    PG_RETURN_POINTER(gbt_var_union(entryvec, size, PG_GET_COLLATION(), &tinfo));
}

Datum gbt_bytea_picksplit(PG_FUNCTION_ARGS)
{
    GistEntryVector* entryvec = (GistEntryVector*)PG_GETARG_POINTER(0);
    GIST_SPLITVEC* v = (GIST_SPLITVEC*)PG_GETARG_POINTER(1);

    gbt_var_picksplit(entryvec, v, PG_GET_COLLATION(), &tinfo);
    PG_RETURN_POINTER(v);
}

Datum gbt_bytea_same(PG_FUNCTION_ARGS)
{
    Datum d1 = PG_GETARG_DATUM(0);
    Datum d2 = PG_GETARG_DATUM(1);
    bool* result = (bool*)PG_GETARG_POINTER(2);

    *result = gbt_var_same(d1, d2, PG_GET_COLLATION(), &tinfo);
    PG_RETURN_POINTER(result);
}

Datum gbt_bytea_penalty(PG_FUNCTION_ARGS)
{
    GISTENTRY* o = (GISTENTRY*)PG_GETARG_POINTER(0);
    GISTENTRY* n = (GISTENTRY*)PG_GETARG_POINTER(1);
    float* result = (float*)PG_GETARG_POINTER(2);

    PG_RETURN_POINTER(gbt_var_penalty(result, o, n, PG_GET_COLLATION(), &tinfo));
}
